12. Use of any drugs known to induce or inhibit hepatic metabolism (inducers such as rifampin, barbiturates, carbamazepine, phenytoin, glucocorticoid, omeprazole; inhibitors such as antidepressants (SSRI), cimetidine, diltiazem, macrolides, imidazoles, neuroleptics, verapamil, fluroquinolones, antihistamines) in the previous 30 days before day 1 of the study